ZIP Code 48418 — Byron, MI
48418 is a standard (street delivery) ZIP code serving Byron, Michigan, in Shiawassee County. To mail something here you only need these five digits — but the four-digit extension narrows delivery to a single point, and it is what USPS bulk postage discounts are priced on.
ZIP code 48418 at a glance
| ZIP code | 48418 |
|---|---|
| Primary city | Byron |
| State | Michigan (MI) |
| County | Shiawassee FIPS 26155 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 4,484 |
| Coordinates | 42.804270, -83.970660 |
How ZIP+4 works in 48418
The four digits after the hyphen encode a delivery segment inside 48418. In practice one segment usually means:
- One side of one block — odd numbers on a street between two cross streets
- A single large building, or one floor of it
- A group of PO boxes, sometimes a single box
- A single business that receives enough mail to warrant its own code
That is why 48418 has no single ZIP+4: two neighbors across the street from each other usually have different ones. Enter a street address above and we will return the exact nine-digit code along with the standardized USPS address format.
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 48418.
| ZIP | City | Distance |
|---|---|---|
| 48816 | Cohoctah, MI | 3.1 mi |
| 48436 | Gaines, MI | 6.6 mi |
| 48414 | Bancroft, MI | 6.9 mi |
| 48429 | Durand, MI | 7.4 mi |
| 48451 | Linden, MI | 7.8 mi |
| 48855 | Howell, MI | 8.6 mi |
| 48476 | Vernon, MI | 9.7 mi |
| 48857 | Morrice, MI | 9.7 mi |
| 48836 | Fowlerville, MI | 10.7 mi |
| 48473 | Swartz Creek, MI | 11.9 mi |
| 48430 | Fenton, MI | 12 mi |
| 48872 | Perry, MI | 12.6 mi |
Questions about 48418
What is the ZIP+4 code for 48418?
48418 is the five-digit ZIP code. The ZIP+4 adds four more digits that identify a specific delivery point — usually one side of a city block, a single building, or a group of PO boxes. Because those four digits change from address to address within 48418, you need to look up a specific street address to get them.
What city is 48418?
48418 is assigned to Byron, Michigan, in Shiawassee County.
Do I need to use the ZIP+4?
It is optional for ordinary mail, but it speeds up sorting and it is required for most USPS bulk-mail postage discounts. Many address-verification and e-commerce systems also use ZIP+4 to confirm a delivery point exists.
Need thousands of these?
Upload a CSV and get ZIP+4, county, carrier route, and delivery-point data appended to every row — or call the API directly.